Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4606c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #46.06; Bulletin of the American Astronomical Society, Vol. 39, p.801
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the mid-infrared colors of X-ray-detected AGN and explore mid-infrared selection criteria. Using a statistical matching technique, the likelihood ratio, over 900 IRAC counterparts were identified with the more than 1000 published X-ray sources in the Chandra Deep Field South and Extended Chandra Deep Field South. Most X-ray-selected sources have IRAC spectral shapes consistent with power-law slopes, fν ∝ να, and display a wide range of colors, -2 ≤ α ≤ 2. Although X-ray sources typically fit to redder (more negative α) power-laws than non-X-ray detected galaxies, more than 50% do have flat or blue (galaxy-like) spectral shapes. Roughly a fourth of the X-ray selected AGN detected at 24 μm show monotonically red (negative α) power-laws through 24 μm. This could be the subset of our sample whose infrared spectra are dominated by emission from the central AGN region. Most IRAC color selection criteria fail to identify the majority of X-ray selected AGN, indentifying only the luminous AGN and those displaying broad lines at optical wavelengths. Thus some forms of infrared selection may be efficent (yeilding a high fraction of AGN) but it is incomplete (many bona fide AGN are missed).
Cardamone Carolin N.
Damen Maaike
Gawiser Eric
Labb'e Ivo
Lira Paulina
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